My alternator belt (V belt) is constatly slipping when the engine is first started. It squeals for about 30 secs then goes away unless the throttle is blipped and then it squeals again. The belt is tight on the alternator and seems to grip the alternator pulley nicely as well as the water pump pulley but it slides over the crank pulley when I attempt to manually turn the belt. I've cleaned the crank pulley with a rag soaked petrol to remove any grease/wd40 (its a saltwater boat so the engine bathes in wd40) but its still the same. There was some light rust on the alternator pulley but nothing major and that just cleaned off. Could it be the belt? It doesn't look worn or bad but maybe its just not as grippy as it should be.
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